Grand Bé is a tidal island near Saint-Malo, France. It is located at the mouth of the Rance River, a few hundred meters from the walls of Saint-Malo. At low tide the island can be reached on foot from the nearby Bon-Secours beach. On the island are the remains of an ancient fort.
François-René de Chateaubriand, a French writer native to Saint-Malo, is buried on the island, in a grave facing the sea.